Generally, there are three types of tortious interference recognized in California. One is interference with contractual relationships (IWCR).Tortious interference takes place when someone intentionally harms a plaintiff's contractual or business relationship with another. In order to be liable for inducing breach of contract or intentional interference with contractual relations, the defendant must have known about the contract. A tortious interference lawsuit allows you to sue the noncontracting person and recover damages for intentional or negligent acts that caused economic harm. Intent of the third party to induce a party to the relationship to breach the relationship. Tortious interference with contract. Proving to a court that a third party intentionally interfered in a business relationship or contract is complicated. On. RUPRO's approval, these instructions will be officially published in the 2017 edition of the. In the breach of contract claim, it.